Question about Dometic Rooftop RV Air Conditioner

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Fan stops duotherm , the a/c runs great for around an hour then the fan stops and the compresser keeps going, turn it off for a while, then runs fine for a while and fan stops again.

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The cooling fan for the condenser is probably running, getting hot and seizing up. Check to see if the fan is free spinning after it stops. Take a probe and try to spin it manually. If it turns freely, then it could be going bad with it's electrical windings, the internal coils that create the magnetic field that spins the rotor of the fan motor. I suspect it is seizing up, however, once a fan seizes up, it usually stays that way and won't spin even after it cools down. It could be a capacitor that is going bad and not starting the fan after it gets hot. A capacitor is a small round shaped can type with usually 2 wires hooked in series with the motor it is trying to start. That is what it does, help start the device (compressor or fan motor). Good luck.Ken from Henderson NV.

Posted on May 31, 2009

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My airconditioner compressor works fine but the fan will not come on .I remove the cover and find the fan is stuck , It is hard to break
it lose , when I do it sounds like the bearing are rusty, then it will
run fine until it is left set for a week or so and it will not star again
until I free it up again

Posted on May 31, 2009

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We borrowed our daughter's Hyundai Santa Fe to make a trip to the mountains on a 105 degree day. It was doing great on mountain highways until we stopped after about 3 hours.


May be a bad fan or thermal switch not working. The a/c condenser sits in front of the radiator. It may be that the load on the engine going up the mountain is too much for just the air blowing across it to keep it cool, and the car shuts the a/c off to try and keep engine temp down. Cruising along on level ground is enough to keep things cool. Going up the mountain means more engine heat and probably reduced speed, which reduces air flow, especially if a fan isn't working.
Let car cool off, start engine and let it warm up without driving. Monitor temp and fans. When temp gets about normal, look for fan to kick on. Then when turning on a/c, look for the other fan to kick on. Don't let engine overheat. If one or both fans don't come on, start there. Check fan motor not locked up, relay working, fuse/wiring good.

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